EDIT....Clearly I need to clarify some things. Yes, I have been in an abusive relationship. Yes, I had the strength and the courage to get out. I stayed for 10 years. When I left I had no parents, money, or job skills. This friend has all of those things but chooses to stay. She does not have self-esteem issues and she also hits back quite often. I am the one who called the police yesterday. The local officers know the situation well as they have been called so often. She refused to press charges once again.
I can only feel bad for someone for so long. You simply can't help those who won't help themselves.